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The South African Railways Class 15 4-8-2 of 1914 is a steam locomotive. In 1914 the South African Railways placed ten Class 15 steam locomotives with a Mountain type wheel arrangement in service. ==Manufacturer== The Class 15 was introduced by D.A. Hendrie, Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1910 to 1922, as a large mixed traffic locomotive for use in the Orange Free State where grades and curvature were less severe than on the coastal sections. Designs were prepared in 1913 for this locomotive, similar in general layout to the Class 12 and Class 14, but with larger coupled wheels. Ten locomotives were built by the North British Locomotive Company (NBL) and delivered in 1914, numbered in the range from 1561 to 1570.〔〔North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser〕 They had plate frames, Walschaerts valve gear, Belpaire fireboxes without combustion chambers and were superheated. In order to reduce the weight on the trailing wheels, steel fireboxes were used. This last feature became standard on large locomotives, but it necessitated the introduction of water treatment plants in some parts of the country to prevent corrosion.〔〔 The locomotive’s one flaw was excessively long fire tubes. On later models like the Class 15A Hendrie improved the boiler by adding a combustion chamber and shortening the distance between tube plates from to in the process.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「South African Class 15 4-8-2」の詳細全文を読む スポンサード リンク
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